
import my_utils.str_util as my_str_util
from my_utils import file_util

print(my_str_util.str_reverse("黑马程序员"))
print(my_str_util.subStr("123456", 0, 3))

file_util.print_file_info("D:\\file\\info.txt")
file_util.append_to_file("D:\\file\\test_append.txt", "月薪过万！")

